TLE6284 G Infineon, TLE6284 G Datasheet - Page 11

• Manufacturer Part Number: TLE6284 G
• Description: ic h-bridge driver pdso-20 - tle6284g...
• Manufacturer: Infineon

Estimation of power loss within the Driver IC
The power loss within the Driver IC is strongly dependent on the use of the driver and the
external components. Nevertheless a rough estimation of the worst case power loss is pos-
sible. Worst case calculation is:
P
With:
P
f
Q
n
const = Constant considering some leakage current in the driver (about 1.2)
I
V
P
This value can be reduced dramatically by usage of external gate resistors.
Conditions :
Data Sheet
PWM
VS(open)
Loss
Loss
VS
RGate
gate
= (Q
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
= Power loss within the Driver IC
= Switching freqency
= Total gate charge of used MOSFETs at 10V V
= Number of switched MOSFETs
= Voltage at Vs
= Power dissipation in the external gate resistors
Junction temperature T
Number of switched MOSFET n = 2
Power dissipation in the external gate resistors P
= Current consumption of driver without connected Mosfets during switching
0
Estimated Power Loss P
0
gate
*n*const* f
10
for different supply voltages V
at Q
Vs = 8V
Vs = 14V
Vs = 18V
PWM Frequency (kHz)
G
20
= 100nC @ V
30
PWM
LOSS
within the Driver IC
GS
40
+ I
= 10V
j
VS(open)
= 25
50
s
o
60
C
)* V
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Vs
- P
11
RGate
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
0
0
GS
Estimated Power Loss P
RGate
10
= 0,2*P
for different gate charges Q
PWM Frequency (kHz)
Data Sheet TLE6284G
at supply voltage V
Q
Q
Q
20
G
G
G
= 50nC
= 100nC
= 200nC
30
Loss
LOSS
Rev 2.4 2008-03-18
within the Driver IC
40
s
= 14V
50
G
60